⚙ OpenTools

🕒 CRON Expression Calculator

Parse a 5-field cron expression into a plain-English schedule and preview upcoming run times.

Standard 5-field cron: minute hour day-of-month month day-of-week.
Loads a sample expression into the field above.
How many future run times to list.
Build it by hand (no cron syntax needed)
Minute
Hour
Day
Month
Weekday

Changing a control here rewrites the expression field above. Editing the expression field directly re-syncs these controls when the pattern is simple enough to reflect.

How it works

Cron expressions have five space-separated fields, each accepting a value, a wildcard *, a list 1,15,30, a range 9-17, or a step */15 / 1-31/2:

minute (0-59)   hour (0-23)   day-of-month (1-31)   month (1-12 or JAN-DEC)   day-of-week (0-7 or SUN-SAT, 0 and 7 = Sunday)

When both day-of-month and day-of-week are restricted (not *), cron matches if either one is satisfied — this tool follows that standard behavior. Run times are computed in your browser's local time zone. Non-standard extensions (L, W, #, ?, and 6-field seconds crons) aren't supported.